From: Chris Wright <chrisw@osdl.org>
To: Ravikiran G Thirumalai <kiran@in.ibm.com>
Cc: linux-kernel@vger.kernel.org, dipankar@in.ibm.com
Subject: Re: [RFC] Lock free fd lookup
Date: Wed, 14 Jul 2004 08:17:37 -0700 [thread overview]
Message-ID: <20040714081737.N1973@build.pdx.osdl.net> (raw)
In-Reply-To: <20040714045640.GB1220@obelix.in.ibm.com>; from kiran@in.ibm.com on Wed, Jul 14, 2004 at 10:26:42AM +0530
* Ravikiran G Thirumalai (kiran@in.ibm.com) wrote:
> This makes use of the lockfree refcounting infrastructure (see earlier
> posting today) to make files_struct.fd[] lookup lockfree. This is carrying
> forward work done by Maneesh and Dipankar earlier.
>
> With the lockfree fd lookup patch, tiobench performance increases by 13%
> for sequential reads, 21 % for random reads on a 4 processor pIII xeon.
I'm curious, how much of the performance improvement is from RCU usage
vs. making the basic syncronization primitive aware of a reader and
writer distinction? Do you have benchmark for simply moving to rwlock_t?
thanks,
-chris
--
Linux Security Modules http://lsm.immunix.org http://lsm.bkbits.net
next prev parent reply other threads:[~2004-07-14 15:17 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-14 4:53 [RFC] Refcounting of objects part of a lockfree collection Ravikiran G Thirumalai
2004-07-14 4:56 ` [RFC] Lock free fd lookup Ravikiran G Thirumalai
2004-07-14 15:17 ` Chris Wright [this message]
2004-07-15 14:22 ` Jesse Barnes
2004-07-15 16:10 ` Dipankar Sarma
2004-07-15 16:22 ` Jesse Barnes
2004-07-15 16:34 ` Chris Wright
2004-07-16 5:38 ` Ravikiran G Thirumalai
2004-07-16 6:27 ` William Lee Irwin III
2004-07-17 0:55 ` Keith Owens
2004-07-17 1:19 ` William Lee Irwin III
2004-07-17 2:12 ` Keith Owens
2004-07-17 2:34 ` William Lee Irwin III
2004-07-17 2:28 ` Keith Owens
2004-07-17 3:16 ` William Lee Irwin III
2004-07-17 13:48 ` Peter Zijlstra
2004-07-14 7:07 ` [RFC] Refcounting of objects part of a lockfree collection Greg KH
2004-07-14 8:26 ` Dipankar Sarma
2004-07-14 14:26 ` Greg KH
2004-07-14 15:22 ` Dipankar Sarma
2004-07-14 17:03 ` Greg KH
2004-07-14 17:49 ` Dipankar Sarma
2004-07-14 18:03 ` Greg KH
2004-07-15 6:21 ` Ravikiran G Thirumalai
2004-07-15 6:56 ` Dipankar Sarma
2004-07-14 8:57 ` Ravikiran G Thirumalai
2004-07-14 17:08 ` Greg KH
2004-07-14 18:17 ` Dipankar Sarma
2004-07-15 8:02 ` Ravikiran G Thirumalai
2004-07-15 9:36 ` Dipankar Sarma
2004-07-16 14:32 ` Greg KH
2004-07-16 15:50 ` Ravikiran G Thirumalai
2004-07-17 8:50 [RFC] Lock free fd lookup Manfred Spraul
2004-07-17 9:30 ` William Lee Irwin III
2004-07-17 19:17 Albert Cahalan
2004-07-29 0:14 ` William Lee Irwin III
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